A train of length ‘x’ m crosses two platforms of length 900 m and 400 m in 4 seconds and 2 seconds respectively . Find the length of the train.

200 m

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100 m

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400 m

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450 m

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560 m

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Solution

The correct option is B
100 m

Let the length of the train be l

$\frac{900 + l}{4} = \frac{400 + l}{2}$

$∴$ l = 100 m

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